package main

import (
	"fmt"
)

func main() {
	t := "hello,world"
	fmt.Println(t)
	s := []byte(t)
	fmt.Println(s)
	s[0] = 'c'
	m := string(s)
	fmt.Println(m)
	x := "x" + t[1:]
	fmt.Println(x)
}
